Last Sunday we were writing about amazing underground diving rigs in the heart of New York City. It seems only fair that we jump across the pond this Sunday and write about a mile-long super secret tunnel lair below London that's currently for sale, don't you think? Asking price: A cool $7.4 million. It sounds a bit much for an empty stretch of nothingness deep below the British streets, but wait until you hear about the history. Oh, the history!

This tunnel is actually one of eight built by the British government during World War 2 as a network of bomb shelters to protect citizens from the German blitz. They could hold 8,000 people and were designed to function for five weeks without any assistance from the outside world. This "protection" even included "a bar and two canteens, not in use, and a billiard room, not to mention functioning water and electricity supplies," reports the New York Times.

However, after their completion, the tunnels were held aside to serve as secret bases of operations for soldiers. They were never used as shelters. Instead, they served as a temporary base for D-Day troops; one even became the European HQ for U.S. Gen. Dwight D. Eisenhower. Later, in 1944, the tunnels became bastions of counterintelligence, as members of the secret service used them to coordinate resistance movements in Nazi-controlled countries. The tunnels, once filled with Normandy invaders, were decked out with spy gear, telephones and teleprinters.

Today, though, the tunnels are empty, and waiting for some rich playboy real estate tycoon to swoop in and buy them up. Won't you take up that standard, and invite us poor gadget-loving folk to a few parties below the busy London streets? Please? [New york Times]